Improvement in furnaces for steam-boilers



s.v Moses.Y Furnace for Ste'am'oilgrs.

@rented oct-.11,1875.

9 l l sllllillll lwnusssss Ny PETERS. PNOTu-LITHOGRAPNER. WASHINGTON. D C- Uur-'run l STATES PArniv'r @relou Y SANDBORN MOSES, or Crimea-iowa V IMPROVEMENT IN FURNACES FOR STEAlVl-BOILEQRSr,v

Specication forming/partlof Letters Patent No. 168,766, dated October 11, 18.775; application filed January/118, li'575`.`

To all whom it may coacewv:

Be it knownvthat I, SANDBORN Moses, of Clinton, in the county of Clinton and State of Iowa, have invented a new and useful Im-` provement in Steam-Boilers, which improvement is fully set forth in the followingl specification, reference being had to the accompanying drawings.

My invention refers particularly to the rebox of locomotive or other boilers; and my pending curved water-leg extending belowl the upper grate, and in which the' latter and the rear lower grate are `arranged to receive the fuel through the front door, and the transfer thereof fronf one to the other being effected over the water-back, the relative positions of the grates, water-back, and the depending leg being such that the latter shall extend below the Vtop of the water-back and the upper grate, and, by its rearward-curved positlon, leave ample name-room between the water-back and the water-leg, and givingthe advantage of setting the latter sufficiently far from the iiue ends to allow of resetting the flues without difficulty.

The water-back is arranged vertically across the fire-box, and serves to support the contiguous ends of the grates, and protect them from being burned out atthe point where the heat is the greatest. By curving the water-leg downward and toward the flue-sheet it is thereby set away from both the due-sheet and the upper grate, and gives an easy draft over the top grate and between the water-leg and the.

water-back, the construction and arrangement affording a most available combination for increasing the generation of steam, while protecting the grates from being burned out at the greatest point of heat.

` In the accompanying drawings, Figure l represents a vertical longitudinal section of the lire-box portion of a `steam-boiler, embracing my invention; and Fig. 2, a transverse section of the same, taken on the dotted line c o of Fig. 1.

My invention-is designed for use with two separate grates, G C', arranged at different heights, so that coal `may be partially burned or coked on the front or highest grate C, and then driven down upon the second grate before replenishing the fire on-the first grate, and thereby maintain a clear hot fire upon thesecond or lower grate. With these grates I employ a water-leg, A, and a water-back, E, in such manner that both shall co-operate to produce advantageous results with respect to the grate. The water-leg is arranged across the lire-box, and extends from the roof or crownsheet77 thereof, curving rearward, and terminating below the front grate and the flue end Z of the boiler.

Two important advantages arise from bringing the leg toward the rear from the crown-sheet, inasmuch as it allows the leg to be set farther back from the due-sheet t0 give ample room for access to the flues for repairs or resetting, and space enough between the leg and the front grate for name and draft from the front Lsection B1 of the fire-box B2 thereof and beneath the water-lee. The rearvard curve also facilitates the draft under the eg. v

As usual, the water-leg A communicates with the boiler-space A2 by openings a in the crown-sheet; but as these would not produce a circulation of the water within 4the leg, besides rendering it liable to constantly fill up with mud, I provide the leg with openings a.' at the opposite ends of the leg, and thereby form a communication of the leg at different heights from its lower end with the Waterspacesof the double walls, and thereby obtain a violent circulation through the leg from the' top and at each end, so that mud cannot lodge therein. The curved construction of theleg tends also to Vincrease this circulation.

The water-back E crosses the re-box in front of the water-leg, and forms the division and support for the grates, the inner bars of which are secured to the upper and lower ends' of the water-back, and thereby prevented from @bein g rapidly burned out, while the Water-back,

having end openings b, joins, like the water-leg, the side walls of the space, and afford a safe increase of steam-generating surface.

The water-back is of a height equal to the distance between the upper and lower grates,

and the flame, in passing from the I'irst t0 the lower' grate, is brought directly in contact with the rear side of the water-back and the front side of the water-leg, the Haine-passage being thus formed by a circulating-Water leg and a waterback,arranged,respectively, above and below the lowest grate. The smoke from the rst grate', in passing under the curved water leg or chamber which divides the box, is brought into immediate 'contact with the clear hot fire on thelower grate and consumed,

adding tothe heat, and .preserving the lues from being coated and filled with a non-conducting covering of soot.

The firebox is connected to the outer front and Aside walls of the boiler by hollow staybolts D, arranged in two or more rows at some distance above the grates,for giving a great number of vent-holes for admission of air, and

' producing more complete -fuel.

The flue-sheet and ilues are protected by the combustion of the water-leg from being damaged by currents of v cold air when the re is being replenished; also, by the arrangement of the separate grates,from the injurious action of the sulphur in the coal, and the violent attacks ofthe clinkers during the breaking up ofthe fire, so that a stronger, more effective, and economical hre-box for steam-boilers is obtained.

I claimv The combination, in a fire-box for steamboilers, of the upper. front grate C and the lower rear grate O', and the intermediate water-back E, supporting the contiguous ends of p the same. with the depending curved water-leg `A, extending below the upper grate C, said grates being arranged to receive the fuel through the door, as herein shown and set forth.

SANDBORN MOSES.

Witnesses WM. H. VALENTINE, GEO. W. PATERsoN. 

